Standard Addition Chemistry problem

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SUMMARY

The discussion centers on solving a standard addition chemistry problem involving the determination of lead concentration using the equation Cx = bCs/mVx. The user plotted absorbance against the concentration of lead added, resulting in the equation y = 0.209x + 2.211. The challenge lies in the vague instructions from the teacher regarding the standard addition method and the missing variables such as volume and concentration of the standard. The value of y when x=0 represents the intercept, which corresponds to the absorbance of the sample without any added lead.

PREREQUISITES
  • Understanding of standard addition method in analytical chemistry
  • Familiarity with absorbance and concentration relationships
  • Ability to interpret linear equations and trendlines
  • Basic knowledge of graphing techniques in chemistry
NEXT STEPS
  • Study the principles of standard addition in analytical chemistry
  • Learn how to calculate concentrations using linear regression analysis
  • Explore the concept of absorbance and its relation to concentration using Beer-Lambert Law
  • Investigate methods for spiking samples to determine initial concentrations
USEFUL FOR

Chemistry students, analytical chemists, and laboratory technicians involved in quantitative analysis and concentration determination using standard addition techniques.

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Homework Statement


hw10.jpg



Homework Equations


Not completely sure, but I believe equation is:
Cx = bCs/mVx
cx = concentration of sample
b= y-intercept
cs= concentration of standard
m=slope
Vx=volume of sample


The Attempt at a Solution


I plotted the values on a graph with Absorbance on the Y-axis and [Pb] added on the X-axis, and put a trendline extending through the X axis. Eqn I came up with is y=.209x+2.211

My teacher was very vague with standard addition and through searching the web it said the best way to figure out the initial concentration is through spiking the samples. I am really not sure where to else to go with this problem since my equation above has several variables that aren't given in the problem statement (volume, concentration of standard).
 
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Well? X in this case represents the added lead in mg/mL. What would the value of y represent when x=0?
 

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